feat: Add generateContent Unary API for aiplatform_v1 (#5003)

* feat: Add generateContent Unary API for aiplatform_v1beta1
docs: Update comment for DirectPredict and DirectRawPredict

PiperOrigin-RevId: 603497761

Source-Link: googleapis/googleapis@4f5f442

Source-Link: googleapis/googleapis-gen@f1d6d8b
Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLWFpcGxhdGZvcm0vLk93bEJvdC55YW1sIiwiaCI6ImYxZDZkOGIzNzVmMWRiZjZkNWRmMjZiY2FlM2JmMGM4YjhjZmRkZjcifQ==

* feat: Add generateContent Unary API for aiplatform_v1
docs: Update comment for DirectPredict and DirectRawPredict

PiperOrigin-RevId: 603498510

Source-Link: googleapis/googleapis@49815f4

Source-Link: googleapis/googleapis-gen@893e2e0
Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLWFpcGxhdGZvcm0vLk93bEJvdC55YW1sIiwiaCI6Ijg5M2UyZTA3MmU3YWE1NGYzZmIwNDI1YTNjMmRhOWEyNjY4YzcwMWIifQ==

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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot post-processor

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---------

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packages/google-cloud-aiplatform/README.md

@@ -301,10 +301,14 @@ Samples are in the [`samples/`](https://github.com/googleapis/google-cloud-node/
 | Prediction_service.direct_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.direct_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.direct_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.direct_raw_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.direct_raw_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.direct_raw_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.explain | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.explain.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.explain.js,packages/google-cloud-aiplatform/samples/README.md) |
+| Prediction_service.generate_content | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.generate_content.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.generate_content.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.raw_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.raw_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.raw_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.server_streaming_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.server_streaming_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.server_streaming_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
+| Prediction_service.stream_direct_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.stream_direct_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.stream_direct_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
+| Prediction_service.stream_direct_raw_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.stream_direct_raw_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.stream_direct_raw_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.stream_generate_content | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.stream_generate_content.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.stream_generate_content.js,packages/google-cloud-aiplatform/samples/README.md) |
+| Prediction_service.stream_raw_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.stream_raw_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.stream_raw_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.streaming_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.streaming_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.streaming_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.streaming_raw_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.streaming_raw_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/prediction_service.streaming_raw_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Schedule_service.create_schedule | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1/schedule_service.create_schedule.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1/schedule_service.create_schedule.js,packages/google-cloud-aiplatform/samples/README.md) |
@@ -572,9 +576,12 @@ Samples are in the [`samples/`](https://github.com/googleapis/google-cloud-node/
 | Prediction_service.direct_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.direct_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.direct_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.direct_raw_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.direct_raw_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.direct_raw_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.explain | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.explain.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.explain.js,packages/google-cloud-aiplatform/samples/README.md) |
+| Prediction_service.generate_content | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.generate_content.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.generate_content.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.raw_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.raw_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.raw_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.server_streaming_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.server_streaming_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.server_streaming_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
+| Prediction_service.stream_direct_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.stream_direct_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.stream_direct_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
+| Prediction_service.stream_direct_raw_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.stream_direct_raw_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.stream_direct_raw_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.stream_generate_content | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.stream_generate_content.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.stream_generate_content.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.streaming_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.streaming_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.streaming_predict.js,packages/google-cloud-aiplatform/samples/README.md) |
 | Prediction_service.streaming_raw_predict | [source code](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.streaming_raw_predict.js) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/google-cloud-node&page=editor&open_in_editor=packages/google-cloud-aiplatform/samples/generated/v1beta1/prediction_service.streaming_raw_predict.js,packages/google-cloud-aiplatform/samples/README.md) |